California

Patent attorneys in California

California hosts 9,553 active patent practitioners registered with the USPTO Office of Enrollment and Discipline. Patent attorneys and patent agents can both prepare and file patent applications, but only patent attorneys can also offer legal advice on prosecution strategy, freedom-to-operate analyses, and infringement opinions in California. Practitioners are concentrated across 20 cities, with the largest clusters in the metros listed below. Notable firms with multiple registered practitioners in the state include Omni Legal Group, BioMarin Pharmaceutical Inc., and Jackson and Co, LLP.

Top cities in California

All practitioners in California

Laura A Harper

Reg. 80886

Patent attorney

Omni Legal Group

Los Angeles, CA · 90067

310-276-6664

Marilyn Harper

Reg. 67677

Patent attorney

Concord, CA · 94520

775-232-8021

Kelly A Harradine

Reg. 69153

Patent attorney

BioMarin Pharmaceutical Inc.

Novato, CA · 94949

415-382-5111

Kyla L Harriel

Reg. 41816

Patent attorney

Jackson and Co, LLP

Oakland, CA · 94611

510-652-6418

Jason Daniel Harrier

Reg. 60964

Patent attorney

Plaid

San Francisco, CA · 94103

202-641-5607

John David Harriman· II

Reg. 31967

Patent attorney

Foundation Law Group

Los Angeles, CA · 90071

424-236-3911

Curtis Lamar Harrington· Jr

Reg. 31456

Patent attorney

Harrington & Harrington

Long Beach, CA · 90809-1719

562-594-9784

Irvin C Harrington· III

Reg. 44740

Patent attorney

Agoura Hills, CA · 91301

Jack R Harris

Reg. 51145

Patent agent

Haverstock and Owens LLP

Sunnyvale, CA · 94086

408-530-9700

James E Harris

Reg. 40013

Patent attorney

Rambus Inc.

Sunnyvale, CA · 94089

408-462-8539

James M Harris

Reg. 52995

Patent agent

Palo Alto, CA · 94306

650-323-4059

Joel M Harris

Reg. 44743

Patent agent

InCube Labs

San Jose, CA · 95131

408-457-3714

Jonathan J W Harris

Reg. 83997

Patent agent

San Jose, CA · 95125

650-919-4476

Michael D Harris

Reg. 26690

Patent attorney

SoCal IP Law Group LLP

Westlake Village, CA · 91362

805-497-3488

Michael R. Harris

Reg. 71038

Patent attorney

Qualcomm Incorported

San Diego, CA · 92121

858-845-8555

Scott C Harris

Reg. 32030

Patent attorney

Law Office Of Scott C Harris

Rancho Santa Fe, CA · 92067

858-756-7778

Joshua C Harrison

Reg. 45686

Patent attorney

Joshua Harrison

Huntington Beach, CA · 92615

714-342-2391

Julie R. Harrison

Reg. 81122

Patent agent

Huntington Beach, CA · 92646

714-206-1553

Michael L Harrison

Reg. 26734

Patent attorney

Michael L. Harrison Attorney at Law

Los Gatos, CA · 95032

408-829-6397

David J Harshman

Reg. 29074

Patent attorney

Toshiba America Information Systems, Inc.

Irvine, CA · 92618

949-583-3515

Candace H. Hart

Reg. 79447

Patent attorney

Sinclair Braun Kargher LLP

Sherman Oaks, CA · 91403

213-429-6121

Daniel Hart

Reg. 40637

Patent attorney

Agilent Technologies, Inc.

Santa Clara, CA · 92051

858-866-6152

John M Hart

Reg. 66989

Patent attorney

Sunnyvale, CA · 94086

650-215-8676

Robert E Hartenberger

Reg. 22108

Patent attorney

Midnight Cellars

Paso Robles, CA · 93446

805-239-8964

Johannah L. Hartley

Reg. 66319

Patent attorney

Santa Barbara, CA · 93101

805-568-2967

Kenichi N Hartman

Reg. 68766

Patent agent

Cooley LLP

Palo Alto, CA · 94304

650-843-5227

Peter A. Hartman

Reg. 57549

Patent attorney

San Juan Capistrano, CA · 92675

949-864-6689

Clare Therese Hartnett

Reg. 35185

Patent attorney

Law Office of Clare Hartnett

Palo Alto, CA · 94302

650-328-6774

Michael David Hartogs

Reg. 36547

Patent attorney

San Diego, CA · 92130

858-259-7573

Arlen M Hartounian

Reg. 52997

Patent attorney

Apple, Inc.

Cupertono, CA · 9514

408-783-1802

Common questions

Do I need a patent attorney based in California?

No. Every USPTO-registered patent practitioner is licensed to file applications on behalf of inventors in any state, regardless of where the practitioner's office is. Choosing a California-based practitioner can simplify in-person inventor signings, local meetings, and same-time-zone calls, but it is not a legal requirement.

How many patent attorneys are licensed in California?

9,553 active USPTO-registered patent practitioners list a California office address on the OEDCI roster. This includes both patent attorneys (who can also offer legal advice) and patent agents (who can prepare and file patents but not offer broader legal advice).

What is the difference between a patent attorney and a patent agent?

Both pass the USPTO Patent Bar and can prepare, file, and prosecute patent applications. Only patent attorneys also hold a state bar license, meaning they can additionally offer legal advice on infringement, licensing, and litigation strategy. Patent agents tend to charge less per hour and are common at large in-house IP departments.